For people who run a team with native trinity, what RW are you picking?
Recently thought of Hand of the Emperor since it stacks with Shout.
My medica is Lenna's so it already give a high regen effect.
My Yshtola has wall, but after getting Lenna's medica, I realized it's more useful to be able to have the first character, whoever it is, hit a RW wall for bosses. If I get Yshtola's SSB, I'll sub her back in when she is level 80. If you want to keep wall, Mog's Heroic Harmony or Faris' Sea Lord Broadside are great picks for a RW, if you don't have those in your party already. Otherwise, Hand of the Emperor or a good medica would also work. I'm not a big fan of using offensive RW's for bosses.
My A-team right now, all level capped:
Squall (Lifesiphon/Power Break/SSB)
Faris (Full Break/Armor Breakdown/Kindred Spirit/Sea Lord's Broadside)
Locke (Thief's Raid/Lifesiphon/SSB)
Lenna (Curaja/Shellga or Protectga/Medica)
Ramza (Magic Breakdown/Lifesiphon/Shout/Medica/Hail of Stones)
Haven't tested on an Ultimate yet, but on high level elite bosses, stacking buffs and debuffs, I can get both Squall and Locke's SSBs to do 9999 per hit. Essentially once I get an elite boss to about 60% hp, it's dead.